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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fec1ffe4009a7c5e67b77f1e4634c764cb570b273b9a95948048829e5ac3be88' 
  AND token = 'hqgfjIl0A//WkZS/9nN/pYMxxl0+kvn2gZW08aPpegY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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