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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e206930f3f354303dc44fdab429dc990539f239ea11bb8f912b51d0d137c436' 
  AND token = 'qOm0ez0GhrqyJV3TUhzx3ATlaa/vObaWBJgTxn1Q7k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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