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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa66c8bfcb8e15d1241d856a6e977ff39dbd6e0f89a2ce5a297742cd7e74bcb6' 
  AND token = 'uPevWUlZsiP+ccLpXxkGPgbVdeuaRuQy2SzKol1t0A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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