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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f89c6bffee455f5b7aa0a1bcb81a5ac2a8c7446dfe089b56e62c59324ad1ed2a' 
  AND token = '+NN+5TbnnwktI1PB2T3q5CweRb90DGXvUfwsi1Ftg8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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