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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0824f612052277d839d7b4af562bfdf4355a33bad42d24837769c7a7e376838' 
  AND token = 'xcPDDBLkKpoe5M6GCHDutJF9ANgi9hl2z+6JHb076eg=' 
  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"
    }
  }
}