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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adec9c7f5c7c4a974cbd5d5ecc09d89dded62a10dd2cb8d1ed3232632c543a37' 
  AND token = '/SEABfm9PeubnGbLDctYL8e4Q9tRR7Ru54/aN3NIAEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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