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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1a37623ea7d5ccbef5ecaf2f6a97ffc2e11da5c6069cd9e2290f5c166d29960' 
  AND token = 'MvM5db8wjN8ghsfjM0S/IVF1+HgxNoK6Cvr59rzRQDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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