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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cef4cccf13b7401f5e52a8421edc58391f4f86a9fcc7d9c52c677d21f6308067' 
  AND token = 'lFkOQ3wBl+3k14U7vDjuFvc6B91y+Zb6V8SRz9M//ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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