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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fbf1085eed981f24c5f906636a7e645bc3c8ae30dff0e3341a04b679714de56' 
  AND token = 'dmgi5U43bJbghjjA+4Y+FNOnD5NupyR/2X8uoPmbBPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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