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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd97ad151aabb844985f5883addc8dc88a9c7485323b7b59bc63aabf6d533a368' 
  AND token = 'SVHdinzRHgvEa+mwVE+InUWrFHwokKG2cBk+pupVW1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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