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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4e6e6788f7c6e7a7ecc04079b20c221a0a3c592b1e219ec003b771605c68c6f' 
  AND token = '2StBxjjiwXP1tFJhxyf4hfpROXlRIuSz0y+fGVDEP3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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