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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6c01bd264eafd6238d6a83842b73efc4c4a1f484d9c3d8623c819e23f3fb55d' 
  AND token = 'CEFGLQmbZ4cqKCG85V9/H8rtopsBBTp6R8gXuDVvIW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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