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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7e9e2d10ebb6e4132d6aa65e9b5a2d6154cdb19b0d4a9956e9a791e35f6d0bb' 
  AND token = 'KBTO6yPoZshGW7eZjO6q8PY8a/5vX9wNmdXSCmPp+gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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