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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cdb84f9d18f3fa0b87278477bd203fa4d07aca04ad3a21267a6916ae22ee763' 
  AND token = 'jFmpe7md8z3aMY2HB6f0InhIE9WdGoC5cTLRkf/kPEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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