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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49a8bcfa3cf2f909d71f4bec98ebf476d6958bdd0d0f532f6b5860c4a434aea7' 
  AND token = 'aFj7M4DbXxbGJS5i3+HbbumAITRgCxQLrrhOiGmg2x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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