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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b78afdd61e2d306a0724755517c8efabee5d31c7a388cf4f6c618c43edf6fddf' 
  AND token = 'qbc2DeVUW+ygoKZSMz0Y6/3NbOZXGkny6SO1bTGRp2w=' 
  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"
    }
  }
}