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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '320029d09c32367550bbd0ab577e92d50f2bac84cf62cc95b04ba1960b706b1a' 
  AND token = 'h2/vlp4GYYXW7N1wmrJUEXrvBrExnZwYxh1MCkS6oqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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