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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8616668f9345ce95604873879ca45a366a297b3cc44139ed3c78969e04f28f5f' 
  AND token = '5wF//cDUx8yUqvxDLUQMPtS/5bV/QQxIpz6zKaLBfaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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