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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1943781add04717b6037c49776f8fa1eb97cc0cbb018d0858cd17a7ac2b74a0' 
  AND token = 'MeZ4Vuf1UTkfFiFJko+RAFppzFuBVG8j2KP6DATB2/s=' 
  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"
    }
  }
}