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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1896a14c0feea466389b422ef79cc794e38a5b586aaf8a5e71ae3b04fb9747b6' 
  AND token = 'gnmfdJ96WXbkeTp/92kxrbEY0ya3KR4+9T0fZXFFVAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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