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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff06e28713e76a5b0988cc7d1ff198bc0d6f1dc97fa682c5c543565ff5a2ac3f' 
  AND token = 'JP5ORhA87YyvfexHCHziEZQqQSMx4/692KVkZgEha84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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