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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f139e8ba4cc39dbefcf72c1db026088e882db2eff82d1ab459c4af3a56990a42' 
  AND token = 'r3CvnMmsTWWl+1ipQD3rYFUg01wdp2LXUZsE1vUHULw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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