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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ba562c40e7f7600c18bcf12cc14c74a3ef401b1aa598cc4edb690529a398ebb' 
  AND token = 'GhR0RawDdc8M7vU5VDRSbm1IOfeEK+f0vBFlYi8mufE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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