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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63b70ddff223f655bc0cb08a9794e89849331c0eaf39f2f366987adaab865476' 
  AND token = 'Vm6maRKKL0f1eSW4fGpfBTm73+n3fFuz0+yUJgreAuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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