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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee839fba26fb0cefe02ae197c08cb6926180ec848d3f952ec2a9b298dab709e4' 
  AND token = 'nnzAbyveLaG9nXWmerdawLKJR92H9E7pA+5RMd5zdUk=' 
  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"
    }
  }
}