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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c275f966024b4259cc329d897a78cca1ae179805b7e1fdde27c5e4bed1c74200' 
  AND token = 'Lab95W660c02XeNs8gv8mrZVjyulafQBL310Ah6g+P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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