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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a8189af83b40545407a4357e4bb00ce328316e10af0d6d87acfb711a86ea851' 
  AND token = 'QCBx+eljVYG2T1VylLqi5wkreRKr0Rkp8GVoy1FT+lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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