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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7dd83e7c14d14bbc79cb09370cf57c4d2c2d077f7d8373afd8505d09e022c1' 
  AND token = 'cTq+DDjyAl2mQJ+nUBB2LoYfXDcmcjimI6uZTvsx7W4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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