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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f62ed822db3a1e5f1d7a00d41b76c6601b754c86d43a6664106305e7017b56a0' 
  AND token = '/At08eJPzik/SopcnXF53tD3Ew2s8L/j+Cl5IIw4PPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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