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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e35da0cffdf0c26db04f32dafd18157b51f378ef1da356f825e66405b0cbe5d' 
  AND token = 'K84upetS3qLTv4x4tNWAET8PEfrSFHeEuAGY8wMYe6A=' 
  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"
    }
  }
}