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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ef11fc58263a5eac133e55e7d17500bec9f1545831d4e7cfcbf7a7502a777af' 
  AND token = 'foJeZ+fZx4CFJk1Y2EVBD275ADM9/l0/f2JDMDcOVLs=' 
  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"
    }
  }
}