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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7246cd81d0b272a2288e3ca6865f33ae31cb474a7cb0dfd7e51535e7ac9e4ca' 
  AND token = '6DKSZhmC7o90hzE/fd+Wg7fvas12UYcs2g+pDT2F41w=' 
  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"
    }
  }
}