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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35ca10217704bd0d7817c8465c95244bc26ebf2d47a44d62c73b6c42802c0d99' 
  AND token = 'qqPMFHRA0G+3wxLIheu48OFN99bcXh5yIZJDwTxbdwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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