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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad3b708e51e73892abb4364d91798ec237e7a22bfa77ccfd2aacd51f46bb1169' 
  AND token = 'Rj2Vf/a+fmR5RJPG9oSotnuT9I8aHXlpdMr95Gl+Gyo=' 
  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"
    }
  }
}