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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e962fd3732a4646d81e168599f0f19bdb8e8be09794dffce34ebfbac4dc89a80' 
  AND token = '3xSSC4S9CH+vcFtkuveQ/XgnTOH4rufB5bF2qy42d0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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