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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '308ee6b4c1821853c6f3e241eabc128682898dada613407106e26ab1014fe0e3' 
  AND token = 'SR2ntjsNZOoMIU1j4/FPRc+htO/eLW9PFl2ALh1fofU=' 
  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"
    }
  }
}