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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3535556cc14d2484367ba4135ffc36a07eade8addf19fb232d57fa1b1c650f66' 
  AND token = 'RAYNzIdI9fT4b6gMStv0u0ePwCRJMFGaL9/Qk1Sy8W4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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