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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5c419134168693e69f50c80010367135dd591ffab1e5512ee51d7a0129d2f1c' 
  AND token = '0/Z54M1vsn6U7479zlNHR1QL/R27zIwiPPwNirAS/j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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