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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bcdac5a811c8675d9dc7cb0021e8a9c6c294fe82ee13a0c35777977f703eab2' 
  AND token = 'VYF6B4c6dnqFiswq5K59r2KHITjFmMLakMfLeP3zjAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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