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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a54a7ea14b90bd562f2e9a63af4fea38dab4ab5d2e4b0b1c72c95c22b7d0e91b' 
  AND token = 'KJUV1dI4uZ8YjJ2qyLVkZpSAIFNWIPdtD2QX+fzkuu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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