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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fdbe62747017a05e0f5b6ee624e54e4e319496db29b347c7e00656e4a4c2008' 
  AND token = 'Bpst9oj1X0eIRWXwtDnG5xLVh/3Lwfc3IvkEpfA5d38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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