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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f0e45c14e40369acc6a961cd2e2d651731c52b3f6bdd8c0e24c2379d9bfff2a' 
  AND token = 'trh2Ly3QnAixGSwjTJrMw/CgT+cAbsLp9exIOx3qqkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}