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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f8498b9b15bc3b2d57317bee8ee50f23beb1af97c3c1913954e407e0a9981f5' 
  AND token = 'enubOzlhaL8djXPzU8w0y6bYLXW08tBOIk3ycwXGeUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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