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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed4bcf1c5b05f3e7d4efae43eefad491a0d4d2c16a4532bea8f02711a8b0ce2f' 
  AND token = 'cMcdboouw/xR+rfM5oXRZ87wfK6jZJjJ/+PcA1lmcTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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