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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b0b48f420e06bd307aac78f7ba13537f14fdb850f69df3b031241bbfb984537' 
  AND token = 'gQ170YB2YJf8gSEuZkbOna7kcLGz5lOLY8McmMoVZwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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