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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4bd8db33f2b619f2dadf266a7beb164aa6f456e373041cb37ee0b265f04e0e5' 
  AND token = 'BxTs/r4IXigjuAsGdhxJZuxehIcYZV2VH+aL44onoz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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