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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e0762e1087245fbbb91fcbca784b630cfbff056d14329bcf11ab7cb0f8f4ef4' 
  AND token = 'y/0tPE8F462z1CPSo8tLe6iJbkn//pZD8OWGkM/XRR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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