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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf13d18261e1051b4ee8a546be7abe691bcbf0e054abe472bf0f267fdf7a01bb' 
  AND token = '0BQ7cbkmjzK3AgAqIuj5lGjQeXauRRvR08PkBzlYsjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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