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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b453b42dd0d705d2e244a0a19e2892af97ab800b978993914f43c2d83f1b8b7' 
  AND token = 'unDI8Zvx56CyL64OWDn5F+S0ShksKISp1VxQa3WyJ3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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